In the production process of PA6 resin, it is generally recommended that the moisture content of the raw material before injection molding should be less than 0.2%. However, the resin will absorb nearly 2.5% of water in an environment with a temperature of 23 ° C and a relative humidity of 50%. Therefore, the resin raw materials must be dried to meet the injection molding requirements. Before the implementation of the drying process, another benefit of measuring the moisture content of the plastic particles is that the drying time can be optimized (such as shortening the drying time from the original 4h to 1h), and significantly reduce energy consumption costs.
In addition, quality systems such as ISO9001 also require regular determination of the moisture content of plastic particles to verify the normal performance of the dryer. Of course, the moisture content of each batch of resin raw materials needs to be determined before the injection molding machine is started.
In this experiment, a rapid moisture analyzer was used to determine the moisture content of PA6 plastic particles. The steps are as follows:
1. Open the door on the right side of the instrument and adjust the instrument parameters. The setting of each parameter is as follows. The temperature is 105 ℃, and the judgment time is 12min.
2. Tare the sample tray and add about 20-30g of plastic particle sample.
3. Press the "↑" key and then the test key to start the moisture determination process.
4. The results show the moisture content of the plastic particles. 
Tests show that the moisture content of the PA6 plastic particle sample is 0.114%, which meets the maximum limit of 0.2% recommended in the injection molding process. Therefore, the raw material can directly enter the injection molding process without further drying.
Figure 2 PA6 correlation curve of three different moisture contents measured by rapid moisture analyzer and Karl Fischer moisture analyzer:
The horizontal line (rapid moisture analyzer) and vertical line (Karl Fischer moisture analyzer) represent the standard deviation experiment. In order to verify the accuracy of the moisture measurement results of the rapid moisture analyzer, three different moisture content of PA6 were tested. The determination of the content was compared with the results of the Karl Fischer titration method (Mettler-Toledo DL39 Karl Fischer titrator was used in conjunction with the Stromboli furnace). Through experiments, it was found that the high reproducibility measurement results of three samples with different moisture contents measured by the rapid moisture analyzer A are very close to the results of Karl Fischer titration (as shown in Figure 2 and the table). Moisture content results of rapid moisture analyzer A halogen moisture analyzer (6 experiments) and Karl Fischer titrator (3 experiments)
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